Lock



n March 8,1927.

M. A. OBRANOVICH LOCK Filed July 28. 1924 II IIIHHV Patented Mar. 8, 1927.

llhlliTE LOCK.

Application led July 28, 1924. Serial No. 728,803.

This invention relates 'to an improved loch which is principally, although not necessarily, designed for use in conjunction with a railway switch operating and signalling device.

It is my object to improve upon loc rs by providing one which is exceedingly simple and inexpensive and which is indeed well designed for the particular purpose for which it is intended;

A further object ofthe invention is to produce a well designed lock structure wherein the parts are so arranged as to provide a very sturdy structure and one which does not invite tampering owing `to the inaccessibility of parts.

Other features and advantages of the in ven-tion may become apparent from the following description and drawing.

ln the accompanying drawing forming a part this specification, and in which lilre nume 'als are employed to designate like parts throughout the same:

Figure 1 represents a side elevation of a railway switch operating device, showing the manner in which my improved lock is associated therewith.

Figure 2 is a top plan view of Figure l.

Figure 3 is an enlarged view partly in elevation and partly in section showing the construction of my improved locl; and manner in which it is associated with the switch retaining means.

As before stated, the improved loch isv especially, but not necessarily, intended for use in connection with railway switch operating and retaining means. Therefore, in order to give an idea of the manner in which the loclr may be associated with such means, I have shown the same in the drawing. A pair of spaced railway and supporting ties are represented by the characters T. Positioned between these is a. switch operating rod R which is connected with a vertically7 disposed rotatably mounted shaft S. This shaft extends through discular plate P, supported in any suitable manner. That portion of the shaft above the. plate is flatfaced as see-n in Figure 2, and an angular retaining member M is secured to the shaft and rotates above the plate. A. lever is carried by the bend of the member M and is adapted to be selectively seated in one of the notches N. The lever is so proportioned with respect to the upturned end of the meniber M to permit it to be swung in a manner to project the apertured locking tongue L thereon through an opening in the top portion of the member-hit. It is with this lool:- ing tongue that my improved lock is adapted to be associated, so that when the lever is seated in one of the aforesaid notches, the

walls with vertically disposed guides 2.11m

which a locking bolt 3 is slidable. This locking bolt is adapted to be projected through and beyond the opening in the aforesaid tongue L, to prevent retraction of the latter. The upper end of the bolt is adapted to be received between the lug l and the front wall of the casing. This arrangement assures rigidity of structure. A horizontal portion 5 is connected with the lower end of the bolt and one end of a coiled spring 6 bears upon this horizontal portion for automatically re tracting the locking bolt. Extending downwardly from the portion 5 is a depending leg or guide 7 which is freely movable through an openino in the bottom of the casing. This depenc ing port-ion 7 is formed adjacent its free end with a notch 8 into which one edge of the opening in the slidable tumbler plate 9 is received. This plate is provided on its top with a shoulder l() to permit a .key 11 to be engaged therewith for moving the tumbler in one direction. A spring l2 bears against an adjacent end of the tumbler and serves to move the same in the opposite direction for maintaining it engaged with the part 7 of the locking bolt. The casing is, o-f course, provided in its front wall with an opening to permit insertion of theqlocling tongue L, after which the locking bolt may be projected through the opening therein.

In practice, the key l1 is turned in a direction from left to right 'to slide the. tumbler plate 9 in a corresponding direction against the action of the spring l2. W hen the tumbler plate is disengaged from the notch 8, the spring 6 serves to force the bolt and portions 5 and 7 downwardly, the last named portion being projected outwardly through the opening` in the bottom of the casing. Normally, however', the free end, of the pon tion 7 is flush with the bottom when the parts are in locked position. This prevents tampering with the internal mechanism of the lock. Of course, to set the lock again,

it is necessary to press the finger against the lower end of the guide 7 to force the locking bolt inwardly against the action of the spring 6. As soon as the boltl is forced in a predetermined extent, the tumbler snaps into the notch 8.

Although I have shown and described the preferred and speciiic embodiment o the new lock, I wish it to be understood that minor changes coming within the scope or t-he appended claim may be resorted to if de# sired. Also, I wish to emphasize the fact that while I have shown the lock applied to a specific kind of device, I wish it toV be understood that it can be used with other devices.

I claim:

A Aock comprising a casing having an opening formed in its front Jfor passage of the part to be locked, guide strips secured to the interior of the side walls of the casing and disposed in spaced parallelism to the front wall, a locking holt slidably mounted in the guideways formed between the guide strips and said front wall` the lower end portion of said bolt extending rearwardly at right angles, a spring mounted in the casing and cooperative with said angularly directed end portion of the bolt for moving the latter normally downward, an integral depending guide stem connected with the right angular portion of the bolt and having its free end projectible thru an opening in the bottom of the casing, a tumbler plate slidably arranged in the casing upon the interior of the bottom of the latter and engageable with a notch formed in said guide stem, a shoulder on said tumbler plate with which a key is adapted to be engaged for moving the plate in one direction, and spring means in the casing and acting on the plate for moving it in an opposite direction.

In testimony whereof I aHiX my signature.

MATT A. OBRANOVICH. 

